package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter("/*")
@Slf4j
public class CheckLoginFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
// 禁止远程访问  数据库
//        String remoteAddr = request.getRemoteAddr();
//        System.out.println("remoteAddr = " + remoteAddr);
//        if(remoteAddr.equals("localhost")) {
//            return;
//        }

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        //定义不需要处理的请求路径
        String[] urls = new String[] {
                "/backend/**",
                "/front/**",
                "/employee/login",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //判断请求路径是否要拦截
        boolean flag = check(urls,requestURI);
        if(flag){
            filterChain.doFilter(request,response);
            return;
        }
        //判断用户是否已经登录
        Long empId = (Long) request.getSession().getAttribute("employee");
        if(empId!=null){
            //将用户id存入当前线程
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //判断移动端用户是否已经登录
        Long userId = (Long) request.getSession().getAttribute("user");
        if(userId!=null){
            //将用户id存入当前线程
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        //用户未登录 响应code = 0  meg = NOLOGIN
        log.info("用户未登录");
        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    private boolean check(String[] urls, String requestURI) {
        AntPathMatcher PATH_MATCHER = new AntPathMatcher();
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
    return false;
    }
}
